Display screen, or portion thereof, having a graphical user interface



FIG. 1 is a front view of a display screen, or portion thereof, having a graphical user interface showing the new design; and,

FIG. 2 is an enlarged view of the callout region 2 of FIG. 1 .

The outermost dash-dash broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining dash-dash broken lines and the dot-dash broken lines show portions of the graphical user interface that form no part of the claimed design. The dot-dash broken line identified by reference number “2” and its corresponding lead line in FIG. 1 indicate the portions of the graphical user interface that are enlarged for magnification purposes in FIG. 2 , and each of the dot-dash broken line, the reference number “2”, and the lead line forms no part of the claimed design. 

CLAIM The ornamental design for a display screen, or portion thereof, having a graphical user interface, as shown and described. 